Valve for percussive tools.



G. O. HANSEN. VALVE FOR PERCUSSIVB TOOLS. APPLICATLON FILED DEC 27, 1912v 1 ,O68,649, Patented July 29, 1913.

2 SHEETS--SHEET 1 11 ITOHWEY C. C. HANSEN.

VALVE FOR PERCUSSIVE TOOLS.

APPLICATION FILED DEC. 27, 1912.

1,068,649. Patented July 29,1913.

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A TTORIVE Y UNIT STATES PATENT QFFICE.

CHARLES C. HANSEN, 0F EASTON, PENNSYLVANIA, ASSIGNOR TO IfiGERSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY .51 CORPQEfiTION OF NEW JERSEY.

VALVE FOR PERCUSSXVE T051153.

Specification of Letters Patent.

Patented July 29, 1918.

Application filed December 27, 1912. Serial No. 7381286.

To all whom it may concern:

Be it known that I, CHARLES C. HANsnN, a citizen of the United States, residing at Easton in the countv of Northampton and State of Pennsylvania, have invented a certain new and useful Improvement. in Valves for PGICllSSlVQ Tools, of which the following is a specification.

' This invention relates to percussive tools and more particularly to a valve motion for such tools of the type wherein the inlet ports of the tool are controlled by a valve Whose movement is effected by comp-re generated in the ends of the cylinder exerted on opposed surfaces through the inlet passages. Heretofore when valves of this type have been constructed 'to control the exhaust passages from the cylinder also a single valve only has been used, having additional portions to control the exhaust passages thus making the valve more tlillicult to throw by c0mpression and also limiting the movement of:

the portion controlling the exhaust passages to that of the inlet passage controlling per tion. In a valve of this type it is desirable to have the movement of the inlet controlling portion which is thrown by comprew ion from the cj lndeiy as smell as possible and, as the volume oi the fluid exhausted from the cylinder is considerably greater than that'of the live tluitl admitted (littl culty has been experienced in providing suf ficiently large eri'haustports when the en haust portion of the-valve has onlx movement as the inlet controllix The ohjcc't of the present invon obviate these (liiliculties .ncl provir which, although positivel -l control inlet and exhaust ports has an inlet not which can be easily thrown by con'ipres in the entls of the cyliinler and which has comparatively slight moven'icnt and an er;- haust. controlling portion which controlled by the motion of the inlet valv and has a considerably greater moveme With this object in View 1 have devised a valve motion, a practical. einhocliinent of whichis shown in the accompanying drawings in whicl Figures 1 to 3 Show a longitudinal tion through the cylinder and valve chest with the valve and piston. in various positicns, Fig. shows a similar section through the valve chest. on a larger scale and Fig. 5

of the valve to their respective entl.

shows a horizontal section through the valve chest on. the line of Fig. 4.

The tool is shown in the drawings as a rock drill which comprises a cylinder 1 in which reciprocates a piston 2. ()n the upper side of the cylinder 1 is a valve chest 3, in the central part of which is a chamber l which is supplied with live fluid through an inlet passage 5. In the opposite ends of the inlet chamber t are the valve seats (Send 7 through which fluid an be admitted to annular inlet ports 8 and} which communicate with the opposite ends of the drill cylinder by iii-let passages 10 and -11. Controlling the passage of actuating fluid to these inlet passages is an inlet valve 12 comprising a.

flange portion 1; which is adapted to seat alternately againsl the valve seats 6 and 7,

35 Ni l!) or sei iaratetl by flanges 26 and 2 morn nmnil': chumhcrs and 1.3 which communicate with the atmosphere through the passage the chambers 22 and 2?) being separated from the inlet chamhers 8 and 9 f anges i-T5 which form hearings i the exhaust controlling (in the opposite ends of the shank .l l i 21' and which alternately seat, within l1 flilllffl (i if! tr,- cut oil minim:n atirin from l7. "l passages to and l? l the. exhaust. p: go From the en-rls of t1 '3 etvlniust valve howls "i7 and .28 fluid passages anil f-lO run lmigitutlialong the center of the valve chest 1 line at right angles and opening; into the inlet portion of the valve chest respeo tivelv at 31 an i 532. These openings are so pla ed and the eleeve portion of the inlet length that these open- {A is of sue, lugwi l he uncovered and thus allow comtion from the inlet chambers and 9 of the valve chest only when the valve and the valve 15 are at the opposite limits of their movements. Passages 33 and 34 lead from points near the ends of the valve chestto the exhaust passage 24 these passages serving to exhaust the ends of the valve chest and allow theexhaust valve to move;

' In operation, supposing the parts to be in the position shown in Fig. 1, the actuatng fluid is entering the front end of the c l inder through the inlet opening 5, cham- S 4} and and passage 11, driving the piston tne back end of the cylinderi After the piston has passedthe opening of the exhaust passage 16 on its backward stroke the actuating fluid remaining in the rear end of the cylinder, will he conn wresscd by the further movement of the "piston and when the pressure "in the back end is greater than the pressure on the forward end of the flange 13 of the inlet valve, the inlet valve will be thrown forward into the position shown in Fig. 2. This will shut off the 31:19 sage of the actuating fluid into the forward end of the cylinder and allow it to enter the rear end through the passage 10. At the same time by its movement to the right lhe sleeve-portion 14 of the valve 12 Will uncover the passage 31 allowing live fluid to pa'ss throughpassage 29 to the rear of the exhaust 'valvehead 27 throw it forward into the position shown in Fig. 3, the fluid in the forward end of the valve in frontof the exhaust valve head 28 exhauat ing throughthe passages 24 and 34 to the atmosphere. This movement of the exhaust valve will open the exhaust passage 17' to the atmosphere, through the chambers 39 and and passage 24 allowing the piston to be moved forward by the live fluid back of it. When the piston on its forward stroke covers the exhaust passage 17 a similar cycle of operation will be repeated in the reverse direction throwing the valves again into the position shown in Fig. 1.

It is. to be understood that the present showing and description discloses only one specified modification of my invention and other forms and modifications are included in the spirit and scope of the invention as expressed in the claims.

What I claim is:

1. In a percus ive tool, a cylinder, its pis' ton, inlet ports for each end of said cylinder, exhaust ports for each end of said cylinder, a valve for controlling said inlet ports alid a separately moving valve for controlling said exhaust ports. v 2. In a percussive tool, a cylinder, its piston, inlet passage to each-end of said cylinder, exhaustpassages from points nearer to middle of said cylinder than said inlet passage, a valve for controlling said inlet passage, said .valve' being operated by compression in the ends of the cylinder, and a separately moving valve for controlling said I e-xhaust passages.

3. In a. percussive tool, a a lindi 7, its piston, inlet passage to each end of said cylinder, exhaust passages from p ints nearer to middle of said cylinder than said inlet passage, a valve for controlling said inlet passage, said valve being operated by compresslon in the ends of the cylinder, and a sop arately moving valve for conlrolling said exhaust PHSSUQ' said exhaust valve being controlled by the moreincnt 0!; said inlet valve.

t. In a port tool, a cylinder, its piston, inlet pa for each end of said cylinder, exhale. pas-sa es for each end of said cylinder, a compression operated valve for controlling said inlet passages, a live fluid operated valve for controlling said exhaust passages, and passages for conveying fluid to operate said exhaust valve, said passages being controlled by the movement of said inlet valve.

5. In a percussive tool, cylinder, its piston, inlet passages for each end of said cylinder, exhaust passages for each end of said cylinder, a fluid operated valve for controlling said exhaust passages, passage-s for conveying fluid to opposed surfaces of said exhaust valve to operate said valve, and a fluid operated valve for controlling said inlet passages, said inlet valve having 'portions controlling the operating flui d conveying passages for said exhaust valvl 6. In a percussive tool, a cylinder, its piston, inlet passages for ca h end of said cylinder, exhaust passages for each end of said cylinder, a valve for controlling said inlet passages, and a valve for controlling'said exhaust passages, said exhaust valve having amovement i-eater than said inlet valve.

7. In a percussive tool, a cylinder, its piston, inlet passages for each end of said cylinder, exhaust passages for each end of the cylinder, a fluid operated valve for c0ntrolling said inlet passages, and a separately moved fluid operated valve for controlling said exhaust passages, said exhaust valve having a movement greater than said inlet valve.

8. In a percussive tool, a cylinder, its pirton, inlet passages for each end of said cylinder, exhaust passages for each endoii said cylinder, a fluid operated valve for controlling said inlet passages, a. fluid operated valve having a greater movement then said inlet valve, for controlling said exhaust pas sages, and passages for conveying fluid to operate said exhaust valve, said passages being cont-rolled by. said inlet valve.

9. In a percussive tooLa cylinder, its piston, inlet passages for each end of said cylinder, exhaust passages for each end of the cylinder, a valve forcontrolling said inlet passages, said inlet passages also serving to convey compression to throw said inlet valve, a valve for controllin' said exhaust passages, said exhaust VitlVfi having a greater movement than said inlet valve, passage for conveying fluid to throw said exhaust valve, said passages being controlled by the movement of said inlet valve.

10. In a percussive tool, a cylinder, its piston, inlet passages for each end of said cylinder, exhaust passages for each 'end of said cylinder, a valve for controlling said exhaust passages having passages therethrough to opposed operating surfaces thereof, and a valve for controlling said inlet passages surrounding said exhaust valve and sliding thereon, and having portions controlling said passages through said exhaust valve.

11. In a percussive tool, a cylinder, its piston, inlet passages for each end of said cylinder, exhaust passages for each end of said cylinder, a valve for controlling said exhaust passages having passages there through to opposed operating sunfaces thereof, and a valve for controlling said inlet passages surrounding said exhaust valve and sliding thereon, and having portions controlling said passages through said can haust wilve, said inlet valve being thrown by compression in the ends of the cylinder conveyed to said valve by said inlet passages.

set my hand.

CHARLES C. HANSEN.

'itnesses JOHN F. Moon, R. J. DAY,

In testimony whereof, I have hereunto 

